Business Combinations, Intangibles and Goodwill - Additional Information (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended			9 Months Ended	0 Months Ended	7 Months Ended		9 Months Ended
	Sep. 30, 2014 acquisition	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014 All 2014 Acquisitions	Feb. 24, 2014 VMware AirWatch	Sep. 30, 2014 VMware AirWatch	Feb. 24, 2014 VMware AirWatch	Sep. 30, 2014 EMC Information Infrastructure acquisition
Business Acquisition [Line Items]
Aggregate consideration				$ 800	$ 1,092
Cash paid	1,771	616			1,068
Fair value of assumed unvested equity attributed to pre-combination services				9	24
Contingent consideration				11			300
Compensation expense						101
Number of Businesses Acquired	4							3
Cash consideration				735
Gain on previously held interests in strategic investments	45	0		45
Aggregate allocation to goodwill	15,859		14,424	563
Aggregate allocation to intangibles				325			250
Aggregate allocation to net liabilities				$ 88
Weighted average amortization period of intangible assets acquired				7 years